Abstract: A power take-off has a bracket attached to a truck engine and provided with a pivoted arm to the outer end of which the pump of a hydraulic system is attached and by which the pump pulley is positioned above and in alignment with a drive shaft pulley. Adjustable resilient means yieldably oppose movement of the pump pulley towards the drive shaft pulley and maintain the connecting belt under wanted tension. The arm may be depressed against the opposition of the resilient means to permit the belt to be easily removed or replaced.